Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf8406df36df887…

MALICIOUS

PDF

80.7 KB Created: 2021-10-12 04:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98a5237af24fb02dd1e1f48a00e4a9b1 SHA-1: 59181cf18e547ae6141db2055a1f5202c2b9ee0c SHA-256: 1cf8406df36df88762f03f8e4dfa7edb949b16aa8039967878cfeb38612e63bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=postgres+create+table+from+csv PDF link annotation
    • http://instant-image.net/UserFiles/Site/File/36143780886.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/fepexosejaz.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/88049003490.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/vaditugulomak.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/pewokuwatetujusajajubid.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/goziwine.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/4488278390.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb53952d3---rolikebufunofum.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufoxigafoturisa.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/86554215656.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/94790477328.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/gopofamawaxuxug.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/1414791712.pdfIn PDF document text
    • http://ezicms.antifftech.com/uploadfile/file///2021100916050365.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd7fe771a17d0da41b54ada3b03d3da1/ketosawina.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/69400440141.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/kaxuruwefavuzoxanururijil.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9d077af25---62654433023.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/13906128220.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/topotilufelom.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b656d087f---zuserimijawede.pdfIn PDF document text
    • https://maviet.vn/upload/files/517369066.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/gejanu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 10692 bytes
SHA-256: e305f7b4a64f612e64eec79b08d44d582a02d11368d2e39157a32bb65af09362
font_02_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 16220 bytes
SHA-256: d21c33ba1a027c1b3e27dd494fae7127e5d193c713798513802c70d91eea8b77
font_03_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 20796 bytes
SHA-256: 7a0ba11d8eb836c3cfd4f711d4c53e1d29ecfc781a2072ba4a53b06a32ae2757

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